package com.activeharmony.util;

/*
 * Copyright (C) 2010 Michael Pardo
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import com.activeharmony.Model;
import com.activeharmony.annotation.Column;
import com.activeharmony.serializer.TypeSerializer;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedHashSet;
import java.util.Set;

import ohos.app.Context;
import ohos.bundle.BundleInfo;
import ohos.bundle.IBundleManager;

/**
 * ReflectionUtils Class
 */
public final class ReflectionUtils {
    // ////////////////////////////////////////////////////////////////////////////////////
    // PUBLIC METHODS
    // ////////////////////////////////////////////////////////////////////////////////////

    /**
     * isModel
     *
     * @param type type
     * @return checks if the class is Model
     */
    public static boolean isModel(Class<?> type) {
        return isSubclassOf(type, Model.class) && (!Modifier.isAbstract(type.getModifiers()));
    }

    /**
     * isTypeSerializer
     *
     * @param type type
     * @return checks if the class is typeSerializer
     */
    public static boolean isTypeSerializer(Class<?> type) {
        return isSubclassOf(type, TypeSerializer.class);
    }

    // Meta-data

    @SuppressWarnings("unchecked")
    /**
     * getMetaData
     *
     * @param context context
     * @param name name
     * @return return metadata
     */
    public static <T> T getMetaData(Context context, String name) {
        try {
            BundleInfo bundleInfo = context.getBundleManager()
                .getBundleInfo(context.getBundleName(), IBundleManager.GET_BUNDLE_DEFAULT);

            if (bundleInfo != null) {
                return (T) bundleInfo.getAbilityInfos();
            }
        } catch (Exception e) {
            Log.w("Couldn't find meta-data: " + name);
        }

        return null;
    }

    /**
     * getDeclaredColumnFields
     *
     * @param type type
     * @return return declaredcolumn fields
     */
    public static Set<Field> getDeclaredColumnFields(Class<?> type) {
        Set<Field> declaredColumnFields = Collections.emptySet();

        if (ReflectionUtils.isSubclassOf(type, Model.class) || Model.class.equals(type)) {
            declaredColumnFields = new LinkedHashSet<Field>();

            Field[] fields = type.getDeclaredFields();
            Arrays.sort(
                fields,
                new Comparator<Field>() {
                    @Override
                    public int compare(Field field1, Field field2) {
                        return field2.getName().compareTo(field1.getName());
                    }
                });
            for (Field field : fields) {
                if (field.isAnnotationPresent(Column.class)) {
                    declaredColumnFields.add(field);
                }
            }

            Class<?> parentType = type.getSuperclass();
            if (parentType != null) {
                declaredColumnFields.addAll(getDeclaredColumnFields(parentType));
            }
        }

        return declaredColumnFields;
    }

    // ////////////////////////////////////////////////////////////////////////////////////
    // PRIVATE METHODS
    // ////////////////////////////////////////////////////////////////////////////////////

    /**
     * isSubclassOf
     *
     * @param type type
     * @param superClass superClass
     * @return return boolean
     */
    public static boolean isSubclassOf(Class<?> type, Class<?> superClass) {
        if (type.getSuperclass() != null) {
            if (type.getSuperclass().equals(superClass)) {
                return true;
            }

            return isSubclassOf(type.getSuperclass(), superClass);
        }

        return false;
    }
}
